CVE-2021-28957

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Source
https://cve.org/CVERecord?id=CVE-2021-28957
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-28957.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2021-28957
Aliases
Downstream
Related
Published
2021-03-21T05:15:13.367Z
Modified
2026-03-15T22:40:07.285891Z
Severity
  • 6.1 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N CVSS Calculator
Summary
[none]
Details

An XSS vulnerability was discovered in python-lxml's clean module versions before 4.6.3. When disabling the safeattrsonly and forms arguments, the Cleaner class does not remove the formaction attribute allowing for JS to bypass the sanitizer. A remote attacker could exploit this flaw to run arbitrary JS code on users who interact with incorrectly sanitized HTML. This issue is patched in lxml 4.6.3.

References

Affected packages

Git / github.com/lxml/lxml

Affected ranges

Type
GIT
Repo
https://github.com/lxml/lxml
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
a5f9cb52079dc57477c460dbe6ba0f775e14a999
Database specific 
{
    "versions": [
        {
            "introduced": "0"
        },
        {
            "fixed": "4.6.3"
        }
    ]
}

Affected versions

lxml-0.*
lxml-0.5.1
lxml-0.6
lxml-0.7
lxml-0.9
lxml-1.*
lxml-1.0
lxml-1.0.beta
lxml-1.1
lxml-1.1alpha
lxml-1.1beta
lxml-1.2
lxml-2.*
lxml-2.0
lxml-2.0.1
lxml-2.0alpha1
lxml-2.0alpha2
lxml-2.0alpha3
lxml-2.0alpha4
lxml-2.0alpha5
lxml-2.0alpha6
lxml-2.0beta1
lxml-2.0beta2
lxml-2.1
lxml-2.1alpha1
lxml-2.1beta1
lxml-2.1beta2
lxml-2.1beta3
lxml-2.2
lxml-2.2.1
lxml-2.2.2
lxml-2.3
lxml-2.3.1
lxml-2.3.2
lxml-2.3.3
lxml-2.3.4
lxml-2.3.5
lxml-2.3.6
lxml-2.3alpha1
lxml-2.3alpha2
lxml-2.3beta1
lxml-3.*
lxml-3.0
lxml-3.0.1
lxml-3.0.2
lxml-3.0alpha1
lxml-3.0alpha2
lxml-3.0beta1
lxml-3.1.0
lxml-3.1.1
lxml-3.1.2
lxml-3.1beta1
lxml-3.2.0
lxml-3.2.1
lxml-3.2.2
lxml-3.2.3
lxml-3.2.4
lxml-3.2.5
lxml-3.3.0
lxml-3.3.0beta1
lxml-3.3.0beta2
lxml-3.3.0beta3
lxml-3.3.0beta4
lxml-3.3.0beta5
lxml-3.3.1
lxml-3.3.2
lxml-3.3.3
lxml-3.3.4
lxml-3.3.5
lxml-3.3.6
lxml-3.4.0
lxml-3.4.0beta1
lxml-3.4.1
lxml-3.4.2
lxml-3.4.3
lxml-3.4.4
lxml-3.5.0
lxml-3.5.0b1
lxml-3.6.0
lxml-3.6.1
lxml-3.6.2
lxml-3.6.3
lxml-3.6.4
lxml-3.7.0
lxml-3.7.1
lxml-3.7.2
lxml-3.8.0
lxml-3.8.0-py27fix
lxml-4.*
lxml-4.0.0
lxml-4.1.0
lxml-4.1.1
lxml-4.2.0
lxml-4.2.1
lxml-4.2.2
lxml-4.2.3
lxml-4.2.3-win
lxml-4.2.4
lxml-4.2.5
lxml-4.2.6
lxml-4.2.6-win1
lxml-4.3.0
lxml-4.3.1
lxml-4.3.2
lxml-4.3.3
lxml-4.3.4
lxml-4.3.5
lxml-4.4.0
lxml-4.4.1
lxml-4.4.2
lxml-4.4.3
lxml-4.5.0
lxml-4.5.1
lxml-4.5.2
lxml-4.6.0
lxml-4.6.1
lxml-4.6.2

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-28957.json"
unresolved_ranges 
[
    {
        "events": [
            {
                "introduced": "0"
            },
            {
                "last_affected": "9.0"
            }
        ]
    },
    {
        "events": [
            {
                "introduced": "0"
            },
            {
                "last_affected": "10.0"
            }
        ]
    },
    {
        "events": [
            {
                "introduced": "0"
            },
            {
                "last_affected": "33"
            }
        ]
    },
    {
        "events": [
            {
                "introduced": "0"
            },
            {
                "last_affected": "34"
            }
        ]
    },
    {
        "events": [
            {
                "introduced": "0"
            },
            {
                "last_affected": "8.8"
            }
        ]
    }
]